/* ==========================================================================
   BENGHAZI TOWER — A NEW WAY OF LIVING
   styles.css

   Palette is sampled from the supplied exterior render only:
   deep black (space / cinematic edge), warm off-white (sunlit concrete),
   muted stone, controlled grey (infrastructure), pale sky, dawn warmth
   off the water. No accent colour is introduced that is not already
   present in the render.
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */

:root {
  /* Colour */
  --ink: #08090b;
  --ink-soft: #101215;
  --haze: #efe9df;
  --stone: #c6bcae;
  --grey: #8b8d90;
  --sky-high: #b3c1cb;
  --sky-low: #e5d7c5;
  --sun: #f7efe2;

  /* Type */
  --font-display: "Cormorant Garamond", "Times New Roman", Times, serif;
  --font-ui: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --ui-size: 0.6875rem;
  --ui-tracking: 0.24em;

  /* Layout */
  --edge: clamp(1.25rem, 4vw, 3.75rem);
  --hairline: rgba(239, 233, 223, 0.28);

  /* Hero framing — every positional decision for the render lives here.
     Change these, not the markup, to re-frame the tower. */
  --hero-object-position: 52% 46%;
  --hero-object-fit: cover;
  --hero-scale: 1;
  --hero-shift-y: 0px;

  /* Atmosphere band placement, expressed against the render's own horizon */
  --horizon-y: 14%;
  --sky-band-top: 0%;
  --sky-band-bottom: 34%;

  /* Driven by JS */
  --scrim-strength: 0.42;
  --vignette-strength: 0.28;

  --ease-cine: cubic-bezier(0.16, 1, 0.3, 1);
}

/* --------------------------------------------------------------------------
   2. Reset / base
   -------------------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--ink);
  color: var(--haze);
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  overflow-x: hidden;
  overscroll-behavior-y: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* No scrolling until the opening sequence has handed control to the user. */
body[data-state="loading"],
body[data-state="intro"] {
  overflow: hidden;
  height: 100%;
}

img {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 1px solid var(--haze);
  outline-offset: 6px;
}

.u-label {
  font-family: var(--font-ui);
  font-size: var(--ui-size);
  font-weight: 400;
  letter-spacing: var(--ui-tracking);
  text-transform: uppercase;
  color: var(--stone);
}

.u-visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   3. Loader
   -------------------------------------------------------------------------- */

.loader {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
  background: var(--ink);
}

.loader__mark {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(0.95rem, 2.2vw, 1.25rem);
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--stone);
  opacity: 0.85;
  padding-left: 0.42em; /* optical compensation for the tracking */
}

.loader__track {
  position: relative;
  width: min(240px, 46vw);
  height: 1px;
  background: rgba(239, 233, 223, 0.16);
  overflow: hidden;
}

.loader__bar {
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: var(--haze);
}

.loader__meta {
  display: flex;
  gap: 1.5rem;
  width: min(240px, 46vw);
  align-items: baseline;
  justify-content: space-between;
  font-variant-numeric: tabular-nums;
}

.loader__status {
  color: var(--grey);
}

.loader__ask {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-top: 0.75rem;
}

.loader__ask[hidden] {
  display: none;
}

.loader__pick {
  padding: 0.7rem 1.5rem;
  border: 1px solid var(--hairline);
  color: var(--haze);
  cursor: pointer;
  transition: border-color 0.4s var(--ease-cine), background-color 0.4s var(--ease-cine);
}

.loader__pick:hover,
.loader__pick:focus-within {
  border-color: var(--haze);
  background: rgba(239, 233, 223, 0.06);
}

.loader__continue {
  color: rgba(139, 141, 144, 0.9);
  text-decoration: underline;
  text-underline-offset: 5px;
}

.loader__continue:hover {
  color: var(--stone);
}

/* --------------------------------------------------------------------------
   4. Cloud fly-through + haze
   -------------------------------------------------------------------------- */

/* The plates are cut from the render's own atmosphere — the fog bank in the
   lower frame, the mist over the sea, the cloud band on the horizon. Same sun,
   same colour temperature, same grain. See assets/atmosphere/README.md. */

.flythrough {
  position: fixed;
  inset: 0;
  z-index: 41;
  pointer-events: none;
  overflow: hidden;
}

.cloud {
  position: absolute;
  /* oversized so scaling never reveals an edge */
  inset: -55%;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
  opacity: 0;
  will-change: transform, opacity;
  transform: translateZ(0);
}

.cloud--far {
  background-image: url("assets/atmosphere/cloud-far.webp");
}

.cloud--mid {
  background-image: url("assets/atmosphere/cloud-mid.webp");
}

.cloud--near-a,
.cloud--near-b {
  background-image: url("assets/atmosphere/cloud-near.webp");
}

.cloud--near-b {
  transform: scaleX(-1);
}

/* The whiteout the sequence begins inside. Its colour is sampled from the
   render's own upper sky at load time. */
.haze {
  position: fixed;
  inset: 0;
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  background: rgb(var(--haze-tint, 222, 213, 204));
}

/* --------------------------------------------------------------------------
   5. Scenes
   -------------------------------------------------------------------------- */

.experience {
  position: relative;
  z-index: 10;
}

.scene {
  position: relative;
  width: 100%;
}

.scene--hero {
  height: 100vh;
  height: 100svh;
  min-height: 520px;
  overflow: hidden;
}

/* Empty containers reserved for the walkthrough. They hold no design yet. */
.scene--reserved {
  height: 60svh;
  background: var(--ink);
}

.scene__reserved-note {
  position: absolute;
  left: var(--edge);
  top: 50%;
  transform: translateY(-50%);
  color: rgba(139, 141, 144, 0.55);
  display: none;
}

body[data-debug="true"] .scene__reserved-note {
  display: block;
}

/* --- hero stage ---------------------------------------------------------- */

.hero-stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: var(--ink);
}

.hero-reveal {
  position: absolute;
  inset: 0;
  opacity: 0;
}

.hero-media {
  position: absolute;
  inset: 0;
  will-change: transform;
  transform: translate3d(0, var(--hero-shift-y), 0) scale(var(--hero-scale));
}

/* An <img> with no src yet must never flash its alt text. */
.hero-media__img:not([src]),
.sky-drift:not([src]) {
  visibility: hidden;
}

.hero-media__img {
  width: 100%;
  height: 100%;
  object-fit: var(--hero-object-fit);
  object-position: var(--hero-object-position);
}

/* Fallback sky used only if the render cannot be loaded. It never pretends to
   be the architecture — it is a plain dawn field so the page stays coherent. */
.hero-fallback {
  position: absolute;
  inset: 0;
  display: none;
  background:
    radial-gradient(120% 80% at 8% 8%, rgba(247, 239, 226, 0.9) 0%, rgba(247, 239, 226, 0) 48%),
    linear-gradient(180deg, #c9d3da 0%, #e1dbd1 46%, #e5d7c5 72%, #bdb5ab 100%);
}

body[data-hero="missing"] .hero-fallback {
  display: block;
}

.hero-missing {
  /* Only ever sits over the light fallback sky, so it is set in ink. */
  position: absolute;
  left: var(--edge);
  top: clamp(6rem, 22%, 14rem);
  z-index: 6;
  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.9rem;
  max-width: 34ch;
  color: var(--ink);
}

.hero-missing .u-label {
  color: rgba(8, 9, 11, 0.66);
}

body[data-hero="missing"][data-state="ready"] .hero-missing {
  display: flex;
}

.hero-missing__pick {
  padding: 0.6rem 1.2rem;
  border: 1px solid rgba(8, 9, 11, 0.3);
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.4s var(--ease-cine), background-color 0.4s var(--ease-cine);
}

.hero-missing__pick:hover,
.hero-missing__pick:focus-within {
  border-color: var(--ink);
  background: rgba(8, 9, 11, 0.06);
}

/* --- atmosphere ----------------------------------------------------------
   No procedural clouds. The moving sky IS the render's own sky: a second copy
   of the same image, masked to the band above the architecture, drifting a
   fraction of a percent against the original. Its lighting, colour, horizon
   and grain match by definition, and the building never moves.
   -------------------------------------------------------------------------- */

.sky-drift {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: var(--hero-object-fit);
  object-position: var(--hero-object-position);
  opacity: 0;
  pointer-events: none;
  will-change: transform;
  transform: scale(1.035);
  /* Two masks: a horizontal band above the architecture, and a fade that stops
     before the city skyline on the right so no building is ever doubled. */
  mask-image:
    linear-gradient(180deg, #000 0%, #000 var(--sky-mask-end, 8%), rgba(0, 0, 0, 0) var(--sky-mask-fade, 20%)),
    linear-gradient(90deg, #000 0%, #000 46%, rgba(0, 0, 0, 0) 66%);
  -webkit-mask-image:
    linear-gradient(180deg, #000 0%, #000 var(--sky-mask-end, 8%), rgba(0, 0, 0, 0) var(--sky-mask-fade, 20%)),
    linear-gradient(90deg, #000 0%, #000 46%, rgba(0, 0, 0, 0) 66%);
  mask-composite: intersect;
  -webkit-mask-composite: source-in;
}

/* One resting wisp of the same cloud material, masked to the sky band and
   drifting almost imperceptibly. */
.mist-rest {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  background-image: url("assets/atmosphere/cloud-mid.webp");
  background-repeat: no-repeat;
  background-position: center top;
  background-size: 200% auto;
  will-change: transform;
  mask-image:
    linear-gradient(180deg, rgba(0, 0, 0, 0) 2%, #000 14%, #000 26%, rgba(0, 0, 0, 0) 40%),
    linear-gradient(90deg, #000 0%, #000 40%, rgba(0, 0, 0, 0) 62%);
  -webkit-mask-image:
    linear-gradient(180deg, rgba(0, 0, 0, 0) 2%, #000 14%, #000 26%, rgba(0, 0, 0, 0) 40%),
    linear-gradient(90deg, #000 0%, #000 40%, rgba(0, 0, 0, 0) 62%);
  mask-composite: intersect;
  -webkit-mask-composite: source-in;
}

/* A single, extremely slow luminance breath over the sky. No hue movement,
   no shapes. */
.sky-breath {
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: soft-light;
  opacity: 0;
  background: radial-gradient(90% 55% at 10% 4%, rgba(247, 239, 226, 0.8) 0%, rgba(247, 239, 226, 0) 62%);
  mask-image: linear-gradient(180deg, #000 0%, #000 24%, rgba(0, 0, 0, 0) 46%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, #000 24%, rgba(0, 0, 0, 0) 46%);
}

/* --- bird -----------------------------------------------------------------
   Empty by default. Populated at runtime with a transparent WebM or a frame
   sequence; removed entirely if neither is present.
   -------------------------------------------------------------------------- */

.bird {
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(120px, 14vw, 220px);
  opacity: 0;
  pointer-events: none;
  will-change: transform, filter, opacity;
}

.bird__media {
  display: block;
  width: 100%;
  height: auto;
}

/* --- cinematic edges ----------------------------------------------------- */

.hero-edge {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-edge::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(8, 9, 11, calc(var(--scrim-strength) * 0.6)) 0%,
    rgba(8, 9, 11, 0) 24%,
    rgba(8, 9, 11, 0) 40%,
    rgba(8, 9, 11, calc(var(--scrim-strength) * 0.5)) 68%,
    rgba(8, 9, 11, calc(var(--scrim-strength) * 1.5)) 100%
  );
}

.hero-edge::after {
  content: "";
  position: absolute;
  inset: 0;
  box-shadow: inset 0 0 clamp(90px, 16vw, 240px) rgba(8, 9, 11, var(--vignette-strength));
}

/* --------------------------------------------------------------------------
   6. Hero typography
   -------------------------------------------------------------------------- */

.hero-type {
  position: absolute;
  left: var(--edge);
  right: var(--edge);
  max-width: 62%;
  bottom: clamp(3.5rem, 9vh, 7rem);
  z-index: 3;
  pointer-events: none;
  will-change: transform, opacity;
}

.hero-type__rule {
  width: 100%;
  max-width: 46ch;
  height: 1px;
  margin-bottom: 1.35rem;
  background: var(--hairline);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.hero-type__place {
  display: block;
  opacity: 0;
  margin-bottom: clamp(0.9rem, 2vh, 1.4rem);
  color: rgba(239, 233, 223, 0.72);
}

.hero-type__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.6rem, 7.6vw, 7rem);
  line-height: 0.92;
  letter-spacing: 0.055em;
  text-transform: uppercase;
  color: var(--haze);
}

.hero-type__title .line {
  display: block;
  overflow: hidden;
}

.hero-type__title .line > span {
  display: block;
  transform: translateY(110%);
}

.hero-type__subtitle {
  margin: clamp(0.7rem, 1.8vh, 1.2rem) 0 0;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.05rem, 2.6vw, 1.95rem);
  letter-spacing: 0.015em;
  color: rgba(239, 233, 223, 0.86);
  opacity: 0;
}

/* --------------------------------------------------------------------------
   7. Interface
   -------------------------------------------------------------------------- */

.hud {
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
}

.hud__wordmark,
.hud__menu,
.hud__cue,
.hud__progress,
.hud__sound {
  pointer-events: auto;
}

.hud__wordmark {
  position: absolute;
  top: var(--edge);
  left: var(--edge);
  color: rgba(239, 233, 223, 0.82);
}

.hud__menu {
  position: absolute;
  top: var(--edge);
  right: var(--edge);
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: rgba(239, 233, 223, 0.82);
}

.hud__menu-glyph {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 20px;
}

.hud__menu-glyph i {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 0.5s var(--ease-cine);
}

.hud__menu:hover .hud__menu-glyph i:first-child {
  transform: translateX(-4px);
}

/* Scroll cue — a hairline that draws downward, not a button. */
.hud__cue {
  position: absolute;
  right: var(--edge);
  bottom: clamp(3.5rem, 9vh, 7rem);
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.85rem;
  opacity: 0;
  color: rgba(239, 233, 223, 0.75);
  background: none;
}

.hud__cue-line {
  position: relative;
  width: 1px;
  height: 62px;
  background: rgba(239, 233, 223, 0.2);
  overflow: hidden;
}

.hud__cue-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 1px;
  height: 22px;
  background: var(--haze);
  animation: cue-travel 2.6s var(--ease-cine) infinite;
}

@keyframes cue-travel {
  0% { transform: translateY(-100%); opacity: 0; }
  30% { opacity: 1; }
  100% { transform: translateY(300%); opacity: 0; }
}

/* Scene progress — reads as a measured architectural scale, not a scrollbar. */
.hud__progress {
  position: absolute;
  top: 50%;
  right: calc(var(--edge) - 0.35rem);
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 0.85rem;
  writing-mode: vertical-rl;
  opacity: 0;
}

.hud__progress-track {
  position: relative;
  width: 1px;
  height: clamp(90px, 16vh, 150px);
  background: rgba(239, 233, 223, 0.18);
}

.hud__progress-bar {
  position: absolute;
  inset: 0;
  background: var(--haze);
  transform: scaleY(0);
  transform-origin: 50% 0;
}

.hud__progress-label {
  font-variant-numeric: tabular-nums;
  color: rgba(198, 188, 174, 0.85);
}

/* Development marker — delete the element and this block to remove. */
.dev-marker {
  position: absolute;
  left: 50%;
  bottom: clamp(2rem, 6vh, 4rem);
  transform: translateX(-50%);
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  opacity: 0;
  color: rgba(239, 233, 223, 0.6);
  white-space: nowrap;
}

.dev-marker::before,
.dev-marker::after {
  content: "";
  width: clamp(24px, 6vw, 70px);
  height: 1px;
  background: rgba(239, 233, 223, 0.35);
}

/* --------------------------------------------------------------------------
   8. Menu overlay
   -------------------------------------------------------------------------- */

.menu {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--edge);
  background: rgba(8, 9, 11, 0.97);
  visibility: hidden;
  opacity: 0;
  /* visibility flips instantly on open so the first link is focusable at once */
  transition: opacity 0.6s var(--ease-cine), visibility 0s linear 0.6s;
}

.menu[data-open="true"] {
  visibility: visible;
  opacity: 1;
  transition: opacity 0.6s var(--ease-cine), visibility 0s linear 0s;
}

.menu__close {
  position: absolute;
  top: var(--edge);
  right: var(--edge);
  color: rgba(239, 233, 223, 0.8);
}

.menu__list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: menu;
}

.menu__item {
  border-bottom: 1px solid rgba(239, 233, 223, 0.1);
}

.menu__link {
  display: flex;
  align-items: baseline;
  gap: clamp(1rem, 4vw, 3rem);
  padding: clamp(0.6rem, 2.2vh, 1.3rem) 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.9rem, 6vw, 4rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: rgba(239, 233, 223, 0.72);
  transition: color 0.4s var(--ease-cine), transform 0.6s var(--ease-cine);
}

.menu__link:hover,
.menu__link:focus-visible {
  color: var(--haze);
  transform: translateX(clamp(6px, 1.4vw, 18px));
}

.menu__index {
  font-family: var(--font-ui);
  font-size: var(--ui-size);
  letter-spacing: var(--ui-tracking);
  color: var(--grey);
}

.menu__foot {
  margin-top: clamp(2rem, 6vh, 4rem);
  color: var(--grey);
}

/* --------------------------------------------------------------------------
   9. Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 900px) {
  :root {
    --ui-tracking: 0.2em;
    /* Keep the tower centred and whole on portrait crops. */
    --hero-object-position: 56% 44%;
    --horizon-y: 18%;
    --sky-band-bottom: 30%;
  }

  .hud__progress {
    display: none;
  }

  .hero-type {
    bottom: clamp(4.5rem, 12vh, 7rem);
    max-width: 100%;
  }

  .hero-type__title {
    letter-spacing: 0.04em;
  }
}

@media (max-width: 560px) {
  :root {
    --hero-object-position: 58% 42%;
  }

  .hud__cue {
    left: var(--edge);
    right: auto;
    align-items: flex-start;
  }

  .hero-type {
    bottom: clamp(6rem, 16vh, 9rem);
  }
}

@media (orientation: portrait) and (max-width: 900px) {
  .hero-type__title {
    font-size: clamp(2.6rem, 13vw, 4.6rem);
  }
}

/* --------------------------------------------------------------------------
   10. Reduced motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .hud__cue-line::after {
    animation: none;
    height: 100%;
    opacity: 0.5;
  }

  .menu,
  .menu__link,
  .hud__menu-glyph i {
    transition-duration: 0.001s;
  }
}